EP1527757B1 - Verfahren zur Herstellung eines prothetischen Implantat - Google Patents

Verfahren zur Herstellung eines prothetischen Implantat Download PDF

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Publication number
EP1527757B1
EP1527757B1 EP04256694A EP04256694A EP1527757B1 EP 1527757 B1 EP1527757 B1 EP 1527757B1 EP 04256694 A EP04256694 A EP 04256694A EP 04256694 A EP04256694 A EP 04256694A EP 1527757 B1 EP1527757 B1 EP 1527757B1
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EP
European Patent Office
Prior art keywords
process according
face
implant
bone
upstanding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04256694A
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English (en)
French (fr)
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EP1527757A1 (de
Inventor
Michael Anthony Tuke
Andrew Clive Taylor
Peter Thomsen
Mark Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finsbury Development Ltd
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Finsbury Development Ltd
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Publication of EP1527757A1 publication Critical patent/EP1527757A1/de
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    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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    • B33Y80/00—Products made by additive manufacturing

Definitions

  • This invention relates to a prosthetic implant, more particularly to a prosthetic implant for implantation in or on a bone of a patient, and to an element for incorporation in such a prosthetic implant.
  • prosthetic implants for surgical implantation in or on a bone of a patient is long established.
  • implantation of a prosthetic femoral implant, a prosthetic acetabular implant, or both is a common surgical procedure.
  • Another operation frequently performed by orthopaedic surgeons is knee replacement, in which a tibial implant is inserted in the top of a patient's tibia, while one or both condylar surfaces of the patient's femur may be replaced at the same by corresponding femoral implants.
  • bone plates may be used to stabilise and strengthen the bones. Shoulder, finger, ankle, and elbow replacement prostheses are also known.
  • the prosthetic implant is intended to bear load.
  • the objective is to fix the prosthetic implant into or onto the bone into or onto which it is implanted as firmly as possible and so as to maintain the bone under loading conditions which are as near as possible to those prevailing in the undamaged bone. This is because living bone tissue, which is continually being dissolved and redeposited by the body, tends to disappear unless it is maintained under the appropriate loading level.
  • the average lifespan of conventional prosthetic implants is about 15 years. Therefore, if a prosthetic implant is to be implanted into an elderly patient, such a working life span is not problematic as the prosthetic implant might reasonably be expected to function for the remaining lifetime of the patient. However, when such a prosthetic implant is implanted into a young patient, it is likely that one or more revision operations will have to be performed during the lifetime of the patient. It is highly undesirable to subject patients repeatedly to the trauma of such a major surgical procedure as is required to replace a failed prosthetic implant.
  • GB-A-2182354 discloses an orthopaedic implant having a surface which, in use, is intended to contact bone and which has a finely patterned conformation composed of a plurality of raised portions separated from each other by indented portions, the indented portions being of a width and depth to allow bone penetration which in use promote an interference fit between the implant and adjacent bone in the region of the patterned area.
  • EP-A-1133957 teaches a prosthetic implant having an anchoring surface provided with a plurality of channels which, when the implant is in position, permits bone ingrowth. Each channel has an opening on the anchoring surface and an undercut region interior of the anchoring surface. Typically the opening is at least 50 ⁇ m across.
  • One technique for producing such channels is wire electrodischarge machining. However, forming such channels with undercut regions via the methods suggested is time consuming, and adds additional expense to the production cost of such prosthetics.
  • US-A-5676700 describes structural elements having a shape similar to caltrops which are designed to interlock with one another in an array to repair, augment or replace natural bone.
  • the present invention seeks to prepare an improved prosthetic implant capable of providing in use a strong cementless fixation to an adjacent bone, wherein bone ingrowth can occur into porous structures on the surface of the prosthetic implant.
  • a process for forming an element for incorporation into a prosthetic implant so as to form a bone-contacting portion thereof comprising a rear face, a front face, and a body extending between the rear face and the front face, wherein the front face comprises a basal surface and at least one upstanding portion projecting above the basal surface and having at least one traverse hole extending therethrough from one side of the upstanding portion to another characterised in that the process comprises the steps of:
  • the height of the upstanding projection above the basal surface is typically less than about 2 mm, for example from about 0.75 to about 1.75 mm.
  • the at least one transverse hole has an axis which extends substantially parallel to the basal surface.
  • the upstanding portion may be of any suitable configuration. Where there is more than one upstanding portion projecting above the basal surface they may be of the same or different configuration.
  • the upstanding portion may be of substantially an arched configuration.
  • the arch may be of a generally curved profile or may be of a triangular or square profile. Thus the arch may be an inverted U or V.
  • the upstanding portion may have a plurality of arches and therefore may be, for example, an inverted W.
  • the upstanding portion has a footprint on the basal surface in the shape of a regular polygon having up to about 8 sides or it may have a circular or elliptical footprint on the basal surface.
  • the upstanding portion may substantially comprise a truncated pyramid.
  • the upstanding portion may substantially comprise a truncated rectangular pyramid, for example a truncated square pyramid.
  • the upstanding portion may be provided with first and second holes each of which extends from a respective first face to a respective second face opposite the corresponding first face. The two holes may intersect substantially at right angles.
  • the finished upstanding portion may be four slopped legs conjoined at their upper end.
  • the upstanding portion can substantially comprise a truncated triangular pyramid.
  • the upstanding portion can have a first hole which extends from a first face, which bends in the interior of the upstanding portion, and which extends to a second face of the upstanding portion, as well as a further hole which extends from a third face to intersect the first hole.
  • the upstanding portion can substantially comprise a truncated hexangular pyramid.
  • the upstanding portion can be provided with first, second and third holes, each of which extends from a respective first face to a respective second face opposite the corresponding first face. These first, second and third holes may intersect.
  • the ratio of the greatest transverse dimension of the upstanding portion typically ranges from about 0.5:1 to about 3.0:1, but is preferably in the range of from about 0.75: to about 2.0:1, e.g. about 1:1.
  • the at least one upstanding portion may generally have a rough surface to further bone ingrowth. "Rough” means not polished.
  • the upstanding portions can be provided with a head portion that enhances interlocking with the bone as a result of bony ingrowth.
  • they can be provided with enlarged ball heads.
  • the basal surface is surrounded by a raised rim.
  • the height of the raised rim above the basal surface may be less than, more than, or substantially the same as, the height of the upstanding portions above the basal surface.
  • the raised rim may surround two or more upstanding portions so that the upper surfaces of the upstanding portions and the rim together define an outer envelope for at least a part of the bone-contacting portion of the prosthetic implant, and so that the basal surfaces comprise valleys within a corresponding rim.
  • each element will include two upstanding portions surrounded by the rim.
  • each, element is substantially rectangular in plan.
  • the element has the form of a sleeve, in which case the rear face comprises the inner face of the sleeve and the front face comprises the outer face of the sleeve.
  • the element may be of any suitable size. In one arrangement it may have the dimensions of about 2mm by about 4mm.
  • the invention further provides a process for producing a prosthetic implant having a body and at least one element of the above first aspect wherein the metal substate of step (i) is at least a part of a prosthetic implant.
  • the element is preferably connected at the rear face to the body.
  • the front face of the element provides a bone-contacting surface on the element.
  • the prosthetic implant of the present invention may be any prosthesis and may be a femoral hip prosthesis, an acetabular hip prosthesis, a shoulder prosthesis, a knee prosthesis, a finger prosthesis, an ankle prosthesis, or a bone plate.
  • the prosthetic implant is a femoral implant
  • the bone-contacting portion of the prosthetic implant comprises a stern of the implant for insertion in a surgically prepared channel in a resected upper end of a femur of the patient.
  • the element may have the form of a sleeve bonded to the stern.
  • the prosthetic implant may be a femoral implant having a stern for insertion in a surgically prepared channel in a resected upper end of a femur of the patient, a wedge-shaped portion having a front face and a rear face extending laterally from an upper end of the stern and a spigot for receipt of a ball head on the wedge-shaped portion, the ball head being for insertion in a natural or artificial acetabular socket, while the bone-contacting portion of the prosthetic implant comprises at least a portion of at least one out of the front and rear faces of the wedge-shaped portion.
  • the prosthetic implant can be a femoral implant having a stern for insertion in a surgically prepared channel in a resected upper end of a femur of the patient, a wedge-shaped portion having a front face and a rear face extending laterally from an upper end of the stern, and a ball head on the wedge-shaped portion, the ball head being adapted for insertion in a natural or artificial acetabular socket, and the bone-contacting portion of the prosthetic implant can comprise at least a portion of at least one out of the front and rear faces of the wedge-shaped portion.
  • the element of the above first aspect and/or the implant of the above second aspect may be made from any suitable material. Suitable materials include stainless steel, cobalt-chrome or titanium. Although not generally preferred, the element and/or the implant may be coated with material to promote bone growth such as hydroxyapatite.
  • the prosthetic implant of the present invention has the advantage that the bone can penetrate the holes in the upstanding portions and truly lock the bone and implant together.
  • the prosthetic implants of the present invention possess the advantage that, after bone ingrowth through the holes in the upstanding portions has occurred, the bone and prosthetic implant are securely locked one to another with no possibility of relative movement.
  • the methods used for making the elements and prosthetic implants of the present invention may permit more cost-effective fabrication than the methods proposed in EP-A-1133957 .
  • US 3905777 describes a prosthesis comprising a solid core and a covering of perforated metal.
  • the covering is formed from several layers of metal foil which have been pierced to provide the apertures.
  • EP 0668062 which defines the preamble of claim 1, describes a bone prosthesis having direct cast macrotextured surface regions. Further examples of prostheses having sloped surfaces can be found in FR 2548889 and EP 0552950 .
  • Selective laser melting is a two-dimensional production process resulting in a three-dimensional solid object. It enables production of components from three-dimensional stereolithography computer assisted drawing (CAD) data.
  • the direct laser melting process entails spreading, optionally using a roller mechanism, a thin layer of a metal powder across an area on a metal substrate where an upstanding portion is to be built. A typical metal powder has a particle size of about 20 ⁇ m.
  • a cross section of the upstanding portion is then selectively "drawn" on the layer of powder using energy from a laser, such as a CO 2 laser.
  • the laser fuses the metal powder so as to form a first layer of the eventual upstanding portion. This sequence of operations is then repeated as often as required until the desired shape of the upstanding portion has been created.
  • An offset technique allows, for example bridges to be formed.
  • One advantage of the use of such a process is that, by changing the intensity of the laser beam at the edges of each layer of the upstanding portion, the result is that the outer surface of the upstanding portion is rendered semi-diffused, thus resulting in a porous outer micro-structural layer.
  • This layer facilitates impregnation of a coating, such as a crystalline form of hydroxyapatite, which can thus promote osteo-integration after implantation.
  • This process can be used to produce elements on the surface of implants or as preforms for subsequent bonding to a prosthetic implant by a procedure such as hot isostatic pressing or diffusion bonding.
  • Melting processes enable production of an element in the form of a tile having a front face upon which are formed one or more upstanding portions of the desired shape and a rear face by which the tile can be bonded to a prosthetic implant. Several such tiles can be bonded or otherwise secured to the same prosthetic implant as desired.
  • one or more tiles produced by one of these processes can be bonded to the front and/or rear face of a wedge-shaped portion of a femoral prosthetic implant which projects laterally from the stern of the implant and has a ball head at its laterally outer end for reception in a natural or artificial acetabular cup.
  • the selective laser sintering process enables the production of an element in the form of a sleeve which can subsequently be bonded to a prosthetic implant, for example to the stern of a femoral prosthetic implant.
  • a test element for use in animal testing may have at least one upstanding portion projecting from both an obverse and a reverse face of a basal surface.
  • Each face of the test element may have the features of the element made by the process of the above-first aspect.
  • 12 rabbits will generally be required for each test to deal with different sizes, and propensity to carry out activity varies.
  • 24 rabbits will be required.
  • one face of the element can be coated and the other uncoated.
  • the coated and uncoated arrangement can be tested in the same animal.
  • the number of animals having to be used will be substantially reduced.
  • a test implant 1 has an outer surface 2 which forms part of a substantially cylindrical envelope. It is of generally rectangular configuration i.e. it has a rectangular footprint.
  • the implant 1 has opposed recesses 3 which are substantially rectangular in shape and which are surrounded by walls 4.
  • Recesses 3 each have a basal surface 5 on which are disposed a pair of upstanding portions 6 which project from a diametral plate-like central portion 7 defined by the opposed basal surfaces 5 of the recesses 3.
  • These upstanding portions 6 have a height measured above basal surface 5 of not more than 2 mm.
  • the height of upstanding portions 6 measured above the basal surface 3 is from about 0.75 mm to about 1.75 mm.
  • the upstanding portions 6 have the form of an arch in the shape of an inverted V.
  • the overall horizontal dimension of each upstanding portion as measured on the basal surface 5 is approximately 2 mm x 2 mm.
  • the test implant 1 is intended for implantation into a bone of a test animal, for example into a rabbit's femur, and for monitoring, in particular, the apposition of bone to the surface and amount of bone ingrowth (osteointegration) that occurs through the arches of the upstanding portions 6 in the recess 3 on one side compared to the amount occurring through the arches of the upstanding portions 6 in the recess 3 on the obverse side.
  • the upstanding portions 6 of one recess 3 will be coated with no coating or with a different coating material from that used for the upstanding portions 6 of the other recess 3.
  • One of these coatings can, for example, be a standard hydroxyapatite coating while the other coating material can be a test coating to be evaluated in vivo. Since the coatings are tested under effectively identical conditions in the same animal the effects of the two coatings upon the amount of osteointegration that occurs can be directly related to each other. In this way the number of animals required for use in in vivo tests can be reduced from standard methods which involve implantation of implants with different materials and coatings into different animals. Thus the use of the implant 1 enables the proper statistical evaluation of the test coating to be conducted with fewer animals.
  • test implant 11 of Figures 3 and 4 is generally similar to that of Figures 1 and 2 and has an external surface 12 that forms part of a generally cylindrical envelope, as well as recesses 13 which are substantially rectangular in shape and are surrounded by walls 14.
  • Each recess 13 has a basal surface 15, on which are disposed a pair of upstanding portions 16 which project from a diametral plate-like central portion 17 defined by the opposed basal surfaces 15 of the recesses 13.
  • these upstanding portions 16 have a height measured above the corresponding basal surface of not more than about 2 mm, typically from about 0.75 mm to about 1.5 mm.
  • the upstanding portions 16 each have the form of a truncated tetragonal pyramid with a pair of intersecting passages of substantially triangular cross-section through it so as to form a tetrapod structure.
  • Implant 11 can be made by any of the same techniques as are described above for the manufacture of implant 1. It can be used in a similar manner to that described for implant 1.
  • Figure 5 shows a side view of a femoral implant 21 for surgical implantation during a hip replacement operation.
  • This includes a tapered stern 22 from whose upper end there projects laterally a wedge-shaped portion 23.
  • a ball head (not shown) for engagement with an acetabulum implanted in the patient's pelvic bone can be fitted on a frustoconical spigot 24.
  • a bore 25 in the upper end of the stern 22 facilitates removal of the femoral implant 21 in case a revision operation is necessary.
  • Each of the lateral faces of wedge-shaped portion 23 is provided with a recess 26 which has a basal surface 27 on which is formed an array including a multiplicity of upstanding portions 28 in the form of tetrapod structures similar in shape to that of upstanding portions 16 of the implant of Figures 3 and 4 .
  • the elements do not include the rim.
  • stern 22 is provided towards its upper end with similar recesses 29 and 30 in which are positioned further upstanding portions 28 which project above corresponding basal surfaces 31 and 32.
  • Reference numeral 33 indicates an axial recess in the top of stern 22 into which bore 25 extends.
  • the upstanding portions 28 can be formed on tile-like portions which are then screwed, bolted, cemented or otherwise secured to the femoral implant 21.
  • the entire implant 21 can be manufactured by one of the procedures described above in relation to the manufacture of implant 1.
  • Figure 8 shows a view from the back side of an acetabular implant 41, that is to say from the side of the implant which, after implantation, contacts the patient's pelvic bone. It comprises a substantially part-spherical body portion 42 whose convex outer surface is visible in Figure 8 . In its opposite top side there is a substantially part-spherical recess (which is not visible in Figure 8 ) with a highly polished surface for reception of a ball head of a femoral implant.
  • a stern 43 projects from a polar region of the body portion 42 for receipt in a surgically prepared bore in the pelvic bone of a patient into which the acetabular implant 41 is to be implanted.
  • a rim portion 44 Surrounding body portion 42 is a rim portion 44 in which are formed a number of apertures 45, 46, 47, and 48 for receipt of bone screws for securing the acetabular implant in the patient's pelvic bone.
  • the convex underside of body portion 42, as well as the underside of rim portion 44 and the upstanding portions 49 can, if desired, be coated with a bone-compatible material such as hydroxyapatite.
  • the acetabular implant 41 can be manufactured by one of the methods described for making the implants 1 and 11. Alternatively the upstanding portions 49 can be provided upon separate tile-like portions which are screwed, bolted, cemented, or otherwise secured to the acetabular implant 41.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Cardiology (AREA)
  • Biomedical Technology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Materials Engineering (AREA)
  • Prostheses (AREA)

Claims (26)

  1. Verfahren zur Bildung eines Elements zum Einbau in ein prothetisches Implantat (1) zwecks Bildung eines knochenberührenden Teils desselben, wobei das Element eine Rückseite, eine Vorderseite und einen sich zwischen der Rückseite und der Vorderseite erstreckenden Körper umfasst und die Vorderseite eine Basisfläche (27) und wenigstens einen über die Basisfläche vorstehenden, aufragenden Teil (28) umfasst, der wenigstens eine Querbohrung hat, die von einer Seite zu der anderen Seite durch den aufragenden Teil hindurch geht, dadurch gekennzeichnet, dass das Verfahren die Stufen umfasst:
    (i) Ausbreitung einer Metallpulverschicht auf einer Oberfläche eines Metallsubstrats,
    (ii) selektive Führung eines Lasers zum Schmelzen des Metallpulvers in einem gewünschten Muster, um eine erste Schicht zu bilden, und
    (iii) Wiederholung der Stufen (i) und (ii) soweit zum Schichtenaufbau erforderlich, um den wenigstens einen aufragenden Teil zu bilden.
  2. Verfahren nach Anspruch 1, bei dem die Höhe des aufragenden Teils (28) über der Basisfläche (27) kleiner als etwa 2 mm ist.
  3. Verfahren nach Anspruch 2, bei dem die Höhe des aufragenden Teils (28) über der Basisfläche (27) etwa 0,75 bis etwa 1,75 mm beträgt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, bei dem die wenigstens eine Querbohrung eine Achse hat, die im wesentlichen parallel zu der Basisfläche (27) verläuft.
  5. Verfahren nach einem der Ansprüche 1 bis 4, bei dem der wenigstens eine aufragende Teil (28) bogenförmig ausgebildet ist.
  6. Verfahren nach einem der Ansprüche 1 bis 4, bei dem der wenigstens eine aufragenden Teil (28) im wesentlichen einen Pyramidenstumpf umfasst.
  7. Verfahren nach Anspruch 6, bei dem der Pyramidenstumpf ein rechteckiger Pyramidenstumpf, ein quadratischer Pyramidenstumpf, ein dreieckiger Pyramidenstumpf oder ein sechseckiger Pyramidenstumpf ist.
  8. Verfahren nach Anspruch 7, bei dem der aufragende Teil (28) ein rechtwinkliger oder quadratischer Pyramidenstumpf mit erster und zweiter Bohrung ist, die sich jeweils von einer ersten Seite zu einer der entsprechenden ersten Seite entgegengesetzten zweiten Seite erstrecken.
  9. Verfahren nach Anspruch 8, bei dem sich die zwei Bohrungen im wesentlichen unter rechten Winkeln schneiden.
  10. Verfahren nach Anspruch 8, bei dem der aufragende Teil (28) ein dreieckiger Pyramidenstumpf ist und eine erste Bohrung hat, die von einer ersten Seite ausgeht, im Inneren des aufragenden Teils (28) gebogen ist und zu einer zweiten Seite des aufragenden Teils (28) verläuft, und bei dem der aufragende Teil (28) mit einer weiteren Bohrung versehen ist, die von einer dritten Seite zu einer Schnittstelle mit der ersten Bohrung verläuft.
  11. Verfahren nach Anspruch 8, bei dem der aufragende Teil (28) ein sechseckiger Pyramidenstumpf ist und erste, zweite und dritte Bohrungen hat, die sich alle von ihrer ersten Seite zu ihrer der entsprechenden ersten Seite entgegengesetzten zweiten Seite erstrecken.
  12. Verfahren nach Anspruch 11, bei dem sich die erste, zweite und dritte Bohrung alle gegenseitig schneiden.
  13. Verfahren nach einem der Ansprüche 1 bis 12, bei dem die Basisfläche (27) von einem erhöhten Rand umgeben ist.
  14. Verfahren nach einem der Ansprüche 1 bis 13, bei dem das Element im Grundriss im wesentlichen rechteckig ist.
  15. Verfahren nach einem der Ansprüche 1 bis 14, bei dem die Basisfläche (27) im wesentlichen rechteckig ist.
  16. Verfahren nach Anspruch 15, bei dem die Basisfläche (27) eine Abmessung von etwa 2 mm mal etwa 4 mm hat.
  17. Verfahren nach einem der Ansprüche 1 bis 16, bei dem das Element die Form einer Hülse hat und die Rückseite die Innenseite der Hülse und die Vorderseite die Außenseite der Hülse umfasst.
  18. Verfahren nach einem der Ansprüche 1 bis 17, bei dem das Element aus Edelstahl, Kobalt-Chrom oder Titan gebildet ist.
  19. Verfahren nach einem der Ansprüche 1 bis 18, bei dem das Metallpulver eine Teilchengröße von etwa 20 µm hat.
  20. Verfahren nach Anspruch 19 oder 20, bei dem der Laser wie zur Brückenbildung erforderlich geführt wird.
  21. Verfahren nach einem der Ansprüche 1 bis 20, bei dem das Element aus Edelstahl, Kobalt-Chrom oder Titan hergestellt wird.
  22. Verfahren zur Herstellung eines prothetischen Implantats mit wenigstens einem Element nach einem der Ansprüche 1 bis 21, bei dem das Metallsubstrat der Stufe (i) wenigstens ein Teil eines prothetischen Implantats ist.
  23. Verfahren nach Anspruch 22, bei dem ein knochenberührender Teil des prothetischen Implantats mit mehreren jeweils von einem entsprechenden Rand umgebenen, aufragenden Teilen (28) versehen ist, wobei die Oberseiten der aufragenden Teile (28) und die Ränder zusammen eine äußere Hülle für wenigstens einen Teil des knochenberührenden Teils des prothetischen Implantats begrenzen und wobei die Basisflächen (27) Kehlen aufweisen, die jeweils innerhalb eines entsprechenden Randes liegen.
  24. Verfahren nach Anspruch 22 oder 23, bei dem das prothetische Implantat ein Oberschenkelknochenimplantet (21) ist und der knochenberührende Teil des prothetischen Implantats einen Implantatschaft (22) zum Einsetzen in einen chirurgisch präparierten Kanal in einem resezierten oberen Ende eines Oberschenkelknochens des Patienten umfasst.
  25. Verfahren nach einem der Ansprüche 22 bis 23, bei dem das prothetische Implantat ein Oberschenkelknochenimplantet (21) mit einem Schaft (22) zum Einsetzen in einen chirurgisch präparierten Kanal in einem resezierten oberen Ende eines Oberschenkelknochens des Patienten, einem keilförmigen Teil (23) mit einer von dem oberen Ende des Schaftes seitlich ausgehenden Vorderseite und Rückseite und einem Zapfen (24) zur Kugelkopfaufnahme ist, wobei der Kugelkopf zum Einsetzen in eine natürliche oder künstliche Hüftgelenkpfanne eingerichtet ist und der knochenberührende Teil des prothetischen Implantats wenigstens einen Teil wenigstens einer der Vorderseite und Rückseite des keilförmigen Teils (23) umfasst.
  26. Verfahren nach einem der Ansprüche 22 bis 24, bei dem das prothetische Implantat ein Oberschenkelknochenimplantet (21) mit einem Schaft (22) zum Einsetzen in einen chirurgisch präparierten Kanal in einem resezierten oberen Ende eines Oberschenkelknochens des Patienten, einem keilförmigen Teil (23) mit einer von dem oberen Ende des Schaftes seitlich ausgehenden Vorderseite und Rückseite und einem Kugelkopf auf dem keilförmigen Teil (23) ist, wobei der Kugelkopf zum Einsetzen in eine natürliche oder künstliche Hüftgelenkpfanne eingerichtet ist und der knochenberührende Teil des prothetischen Implantats wenigstens einen Teil wenigstens einer der Vorderseite und Rückseite des keilförmigen Teils (23) umfasst.
EP04256694A 2003-11-03 2004-10-29 Verfahren zur Herstellung eines prothetischen Implantat Expired - Lifetime EP1527757B1 (de)

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GBGB0325647.6A GB0325647D0 (en) 2003-11-03 2003-11-03 Prosthetic implant
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US20050119759A1 (en) 2005-06-02
DE602004014874D1 (de) 2008-08-21
US7497876B2 (en) 2009-03-03
EP1527757A1 (de) 2005-05-04

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